Engineered for robust performance, this M21x71mm Hex Head Cap Screw, crafted from corrosion-resistant Aluminum 6061, offers superior strength-to-weight ratio for demanding structural and mechanical assemblies.
| Standard | ASTM A106 |
| Material | Aluminum 6061 |
| Finish | Passivated |
| Grade | N/A |
| Size | M21 |
| Length | 71mm |
| Head Width | 30mm |
Purpose-built for heavy-duty applications, this M21x71mm Hex Head Cap Screw features a nominal diameter of M21 and a total length of 71mm. The hexagonal head provides a substantial 30mm width for secure torque application, ensuring reliable fastening. Constructed from Aluminum 6061, a precipitation-hardened alloy, it exhibits excellent corrosion resistance, good weldability, and a commendable yield strength. This makes it ideal for environments prone to moisture or chemical exposure where traditional steel fasteners might degrade. Its lightweight nature is particularly advantageous in aerospace, automotive, and marine industries where weight optimization is critical.
This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.
1. Ensure mating threads are clean and free of debris. 2. Hand-thread the screw to confirm proper engagement and alignment. 3. Torque the screw to the manufacturer-specified value using an appropriately calibrated torque wrench, ensuring the head is seated firmly.
| Standard System | Designation |
|---|---|
| ISO Equivalent | ISO 898-1 / ISO 4014 |
| DIN Equivalent | DIN 931 / DIN 933 |
| Primary Standard | ASTM A106 |
| Tensile Strength | Standard Commercial Spec |
| Yield Strength | Standard Commercial Spec |
| Hardness | Varies by specific batch |
| Bolt Size | Dry Torque (ft-lbs) | Lubricated Torque (ft-lbs) |
|---|---|---|
| M21 | Check Calculator | Reduce by 25% |
| Size / Type | Est. Weight (lbs/100) | Shipping Weight (kg) |
|---|---|---|
| M21 | Varies by dimension | Contact Sales |
| Environment | Rating |
|---|---|
| Indoor / Dry | Excellent |
| Outdoor / Exposed | Moderate |
| Marine / Saltwater | Not Recommended |
| Chemical / Acidic | Not Recommended |
| ❌ Mistake | ✅ Correct Approach |
|---|---|
| Over-torquing the aluminum screw, potentially stripping threads or deforming the material. | Always consult the torque specifications for Aluminum 6061 fasteners of this size and apply torque incrementally with a calibrated torque wrench. |
| Using the wrong tool for the hex head, leading to cam-out and damage to the head. | Utilize a correctly sized, high-quality hex socket or wrench that fits snugly to maximize engagement and prevent slippage. |
A: This Hex Head Cap Screw, Aluminum 6061 is manufactured from Aluminum 6061.
A: Structural frame assembly in light-weight machinery, Automotive chassis and component mounting, Marine hardware and deck fittings.
Conversion factor: 1 ft-lb ≈ 1.356 Nm
| Status | Mating Component | Standard | Torque Spec | Engineering Notes |
|---|---|---|---|---|
| No verified compatibility data found for this component. | ||||